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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc913f4b4c1d719523e2e732a9eced91bb1d9e5c41ef2c3f11d0ace1278906d3' 
  AND token = 'IcUb9zn2q23Wj8IugGCWk+WtL9Z1N5CMMJs9AF4aZDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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