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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8dfed691cd137cea1b38895c4f457461e08501df84cec007837be5bdf9d7be8' 
  AND token = '8CKGZRl6GpuJn7pu5fzO49F6/veDvGLZzxxx8M6ALKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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