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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519506b40b7e6158616c954cd69f08ed922d1600dfcb0246890ca4ee6b544c1b' 
  AND token = '0eLnFReO8JVi/f8TBU+OmNBvEhmKgLpvT6WI6V6Z3gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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