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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a0df752a223f0993d344ed207bf6ec3ec7d5214d6fbd1d3f082c1bc3e38bcb' 
  AND token = 'vprH+o655bZH6BwZZFako7chaKbYLf0HWdJSX1dsxx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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