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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e74164a8213ea1055c3cc37beea8fbcaeb85a0e40fc52db808eee6e0b6e11b' 
  AND token = '2WUwr4Miwuo6NZhtxaER6pV/cAuR7tonhVrk1smbuME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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