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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16abe048d3091595923b118a82dd6e30dedd62e04e75b3cfb05fe1c3502945e3' 
  AND token = 'zhtsc97lR+zlEGblyMHse+YNl8p8RluvrG8pZ/OAZ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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