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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bf69c768a301b4bbe46de1a1001f0ae29cb1dcfff98bf32a995a93b5cd6901' 
  AND token = '81iDt3giTR7Oqws6KuiRlDE53NtQzlRHPgL8KwKlt1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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