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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe81a7f70c8e4d2289f4b0e2f66a3cf964548f027ade24f01d78dc89a6e2503' 
  AND token = '58MlylyswB53LnRW6hLvG1ef/1sYRcnvz59jcNaKJQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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