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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec01e2bdaf9baa6cb0fa63da0e16069b8773c0cc07069c77cd275840319009f6' 
  AND token = '6JHbZaGzeAvMROd9IV1j9U09+6/Jt/n2DPbwg7OJJ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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