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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5aaad47e0180c48f4e13d5352be0edacc8c5d680c464868da13d32f48db4f26' 
  AND token = 'qCACyE3hBP3RfF3v70Csm39ED5v2pf1Xrff2pgoU70g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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