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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd69c19f71d9b469aae523cc2fd50ad990299d17a9b24f3f1772cebf759af520' 
  AND token = 'OXOcodNRNVF+tcBuqq1c2Q5vu/WkyRT4gIrhqc3cbLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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