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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c75de79c916700fc5879c3f8fe656d2f8c38fb8894c245a2ba88674dce4fff' 
  AND token = '/X1XUh5l+qRNvRLlR1AMr60nRHm+oTneEOZd+ovY8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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