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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c7444d7e8db8b2e71fb19dcd31fac29f4edff4788144085b418dc38917f406' 
  AND token = 'qltzRRdt/NSMgN9LLSI4mJc56SOEBZaOAM9oPDEWbRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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