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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543dde67e840455e41bcc191f51a328c58137ed769510ee888a540dfdde2d636' 
  AND token = '7tlvP0KFi6+GT3qKrPqTBvEQJr9CU6Quv7XjJs2yMhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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