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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f4e5665d625f5afe9dcbc6710f1034dafeddf4c383d4edcec75eb328afbd0a' 
  AND token = 'GmgfLq4Z87LsvqqgO/+bETvHgm1TPDEA11uwxCxf7e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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