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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9017a1900bfc5a7649df4428c9e1ac3a0b9d2882a62cd92adc3fbcf0fb258008' 
  AND token = '5oI9g7N+E7Xkz5iJ64bdizcrQKreG9MhgZzJzGnJquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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