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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5932446ed5caedf20425d5359f13b2e229ed60a0706ccd64ab5584217bce3a20' 
  AND token = '0vzaZeqOmiqhj7P12t+3/xgvu1VQDmsj/RudkqRP9po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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