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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0dd2d1042e40efcdbf63fedb6aca7e9c871116aa5611d72adc2dc1e10a9f76' 
  AND token = 'wG5QIrnjO/i0GeElcDBh6AZ7AyT6d9BnoE/huhPaAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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