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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f8928a8ef39fe55bb237c7bb743c06b91cd7ac45428a0c8e5ed5b572aa0fe2' 
  AND token = 'g7iYEpgFltDK0wdI227ytaIrLL1FwyLTat1qhS3aQb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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