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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b824031532346758c0ecee84c900c4879d5aa786c4c83f0333dcfe781a9e67' 
  AND token = 'On57zO1HvTxR2+8NJi6wDES+Z/rxfxg1jNdwozsbhDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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