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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51668cca7f99b4a8127532cda2ef6e82af0a4d7884ef1ae200b223486a67e747' 
  AND token = 'IgvTYRFS37iP88Fpf3IB4YasLSpgPnLrdEGZ0SFyRJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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