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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c275b50642e51be2bd94ffba34eb9b953402089290701b0702751ad5b221d9' 
  AND token = '/uZwMSvBB/c44JJ6gUh39kRxq3cZmun+6eXRkHrOZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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