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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbba64868290a5e66e246f38d77b2afd2527d852afa501b6f63e999de9f073a' 
  AND token = 'PSwQFm9t0AWT9z0aBSgS7N8U7Sjee6VUexROLjmuRPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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