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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2987150b7ba39c6ed0e13dd24af3539222c22d0ba5e1edb58e4cb11f9b9cb5' 
  AND token = 'H06hMhQuIdzY5nkJJP0hCljWJTwhyD06lSdeelW6LcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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