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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb817542c336d435f9f5fd3a8c9a6a99c6a5835adad16fa7ab826017fd71318' 
  AND token = '62wjVVpa2d+vEOnwcw03hwQz/Em0J0AR5mQqkmmTCHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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