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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e941205c21e6ae56b7678fa87b4ef21929df4f4276e13941263db1f72de7e197' 
  AND token = '5kuIUdeACEXWvPaHrgGzIRFY+CfxG5MeTisbvnj14u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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