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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5d90aadd1bd1a644b976973f81c714843ca49da549bc91d8b784de063afa5b' 
  AND token = '9cyU095/mOg/lT2yR5ELy7kGg/eiGOMgmJEyrKVl5JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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