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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f024f9cca5d900a810e619d4b4d31207f4a828f6e076af66d37ed3622edb37a' 
  AND token = 'qtdH0Ta/DzHepNQOnf37KIfDJNotH+HZW4MOGZ7vAz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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