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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919a1adcc919f21ce372a4c71b1fb547926ff18e25286539aceeb32ffaed714a' 
  AND token = '79OyTT88QjwU7UCLVZOIRlAmTvSk4raghk6rfPq9QIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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