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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23acaebfbaec430f93d85cce187a4d60f79cdbe8a5322fb302942e70535bae60' 
  AND token = 'z894EyW/DRx194P+JX/Tf28CIBR07NcqkWFIoLmQdt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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