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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7162f94de5f531381f1265b80f35d87139df4a0e872faf50699ce548fb21cd31' 
  AND token = '0tQFfIK08hkQSPCIva0+1cQRHCulmYKv7Szg9kh4FSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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