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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984c04dad70de88432788d6083e2949116ec18d94b3cca252866a6b6457ad819' 
  AND token = 'lrYuc/xsaT8ZEjIlU+3JuCzFGV/8Uv/mHW4Yy7oJP9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}