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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953a1c483bd03006333a049fab857f02b60cae6a1ae594cd7f1573489fd739d0' 
  AND token = 'Wz2NaIU8JnSteeE4xuQumPeKIUp6K1EsRcaq/vQVMUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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