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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1420fbfe8fb9d1b3a6afe73d70c970adb5d5cfa2ef66971fd169799980de2ab' 
  AND token = 'HKnYlWErSp0Xt74Kpx1fGbrZIcpwT4gi9N8FwO7kHCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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