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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679bec9866226a1a31f699913a3c8be5b0c3ed841b4307e03f477c569baf5b54' 
  AND token = 'TtMKEiBfnckYSfs0w8+U7Lst/vI3BjxmM41BZ1p0Lus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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