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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ef5f6eb6b8defea84de505a3cd4ccf32ede3ed0554c161631eec2b4ca7e5a0' 
  AND token = '3E9Gin5zBP2C2PRQ/OipfTUSjSnrv2wPcHUmhsFCWrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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