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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7318baab8cac0c9f88cb11c457d00b92a31290e9e4345487afe7dd8fd0e232' 
  AND token = 'T9thWQ+ih1l18CpG4Ggl70TUuu2nsa1pHYO+6FNnemY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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