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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d8caf7e530d7be1f771c4ac1e650fd8005d1eaef02a98c589059901a9bff27' 
  AND token = '0ZcuiQaPlG2lQCuxB+EG37G/vBCEAOEIAoMd+teoI/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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