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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f460b8f0f9f9df37cd2155ba1ff9733747a2cdd694fdde04508d7c5eda6f07e' 
  AND token = '80P2b0pB0Ag5z9efmiaUMnRC4uyKKOzaD+JZIpXLIvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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