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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1ab39c44fe36d1d9cc6726b7b556e2b206a9bac6f0f37b15ec8d012939d870' 
  AND token = 'SsIXEhHyZuxnwEN8y5ooeMtmU8xiXFD5A+Lia/doYBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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