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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cad20434ea591f1f48ad4b51617aaeed39f967428b408c2a83500adadd09651' 
  AND token = '/CTXWg0cINCwlD2iahs9KOqMRRCn4qrOsfZxzJT0B6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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