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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e3a3e06d974f73d9cb593e71e6662bb1ae68c662bcaf713f1cbda12c44bf6d' 
  AND token = 'HIZdCdkDAAtO+1wVT6kMaggijeI/mEWyIiWATH4Womw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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