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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5282e2d5074a5dc9d7e361b59bd3db492040e65f58e2a10b0aee5186dacf9b9' 
  AND token = 'i4i/RcpgH9KX1444EqHQ33H+V4fxB0/zBQ96RKATOSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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