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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cc275a3e471c3cfc7023846fcf41346c3dff06f8ba296f3f748cb78e6ec090' 
  AND token = 'gMFSKiySh9P+hF3kJhbqQX3ZNTFgrpk5Ng5E54t0guw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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