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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c1ff00d2f90bab90866cea4cfdba2a4dd561b7870722343c654c0832d6caa6' 
  AND token = 'mlwoT5HCirp3zYdU8rIxcUJXE6I9KKIPHu+5qiJAl0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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