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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fe9999d50c0158e2092ab8ef0c96c2f8dfff80bbcf4a41d0c3b3f2ee79d971' 
  AND token = 'LIfLlAHnA3XwgNa/ibMVPR6O7BPesvZAk329uxB9PwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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