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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38ef2f5c3a3b9da4840f5a642da37ce7f89c893dd4dc61caa02acb3c77d83cd' 
  AND token = '4HBpRJnq3S1hE7WaIrO2OcaTLwl4h0MIpnau7WyL5XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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