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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b009d500d37d77200d8e02ea1d851d2eedf84407d686484f5efb8a75874ff1' 
  AND token = 'ufcEHUXzn2mcS7dprzyzABfd3RJ9SKj4nGJc6UsTq7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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