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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbf1f37d75f58e3a1ffaee99558e4c5f48f9e6e6b3b08be33395e78fff1fb6c' 
  AND token = 'HkedT00B3zZhy77Xf4hlmLEAeC8T2z6FF87xBfQ7HOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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