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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f817a76c036f121eab310377d54294d08e96ffa857fcec00806867cf65566c4c' 
  AND token = '5SKddzhG+vKcrWYO6mvO/SML+TbrjvFoWAw8+dkVnhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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