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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e1454a470a0399d112dcc481d68d469b8ccd09ff53000d048f60d04b228b0f' 
  AND token = 'xe0+n6o/XFtRjIEFydTyuSYB9nAqf99jV7chEayRp8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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