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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2acad0613932e806f2c5ccd94ba21fe7fa6faf2d5c87b4dcc27e3fb47054d2' 
  AND token = 'hZEpCY5xc4RL8cI2TmA/kygrWhaBYhU5dcPdf80soOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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