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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8db42c6e70b733ec67d79918ae0925efaee9760100f83972e450301c97b0e7' 
  AND token = 'BW967Y5GK5A35Ror5Bz0hytiKaRKvPzNn92GIrItDcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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