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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6d65ed302cb584b55994deac98369a38d8e72416bb9afc3a68ebcd8e98ae59' 
  AND token = '0zDQ1w8bBqJ1CzoMvi+Awqlem+oNhtWBj/5nNQDh5c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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