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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a65167bfc3d0b9744eb424b664dff082b4729af5630056230c230694257186' 
  AND token = 'S2jM4kZAJXK2MPiDTHdy3URCsZmipMeRB0l3oQ/+eMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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