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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e399eb238597b09cb402291a5830dab1a2906c1fb11a73320630f35c04b1176' 
  AND token = '9o43lco8nFWr8kJbInmO6z4J4XIUJQIVo3otBnhZnLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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