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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd682d45b8556de643180a57fa01fe12c8d4eb1a04f6d5f3210f664b7e2411d69' 
  AND token = 'hpuZJJAkkPDaMF617iYdm3u2UNmeOXMc1ZjDPiaN3nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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