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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ba10df7cbec87762cadbd135fb60e0270953cfc28f3378cc6beafd1e9fc0a6' 
  AND token = 'mBsVbEGBhRpyreaL8M+8d7281HursSEcszTtpQ5tshI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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