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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c539f8d17065477d6e55ed7752eae834e772aa8807b1f507485237dbafcf4c' 
  AND token = 'EIqLxwYGp/d5h0MC0TBKSEjr0br8FtqAVLxyboweiN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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