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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60e3e14020f11a552e5a447ff875347a2a2aa1b1eceb001a7a9ec6bd171b1ea' 
  AND token = '7W2tBJqXC0uaSXfyh9Ex6UCTlWvvWHKcyitWhD7Fpe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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