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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3bdc9a0bdfd0161880ab6ac9b0c3913517878e4c8294fbcd1b3cff7b692b9d' 
  AND token = 'tPCMKw4WM1paYQxzist1KgwPbrPudpWV56Vy37R5dwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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