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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cc858b0547d37e81fe53d0a4d01f375494609f56e715ca265c5a6e4cafe23f' 
  AND token = '+Fol5tFe6yUpuGOwIa0RWcZGKjH9TKNoSYQntB8VZfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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