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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2918e97e891ab2dd77ee05f21e0e72557d053f97e50d49258eba08400ae29d' 
  AND token = 'HFlEHJrrufjse2KRoMVLQr1Okr1fmC5Yko5aLvKbt9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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