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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3c31c9b837aabdf06dfd88f9af3c9aa849a87d0f0e62f38f74d785d98c3409' 
  AND token = '/VYylNVB/XaMy28l71MBAMSwoRVYDQ3fXSBx8bfFW+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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