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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c528d4a6471d20e50b5ab1a89fbb529fe3dd4748afe6a1e910b34ce13525c98b' 
  AND token = 'h1sQbGk6YptTlAek7xCd3LbitSRlcJCTLynpSxpJ6GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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