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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8303589e4599aac40b32884be8f1ffbc90a8f95848356b8c5d8e9aeea69a2111' 
  AND token = 'qXWDS59d+nq8EvJa6v/79IVawod8VdlcLfAjG4Lr3sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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